Effect of soil washing with only chelators or combining with ferric chloride on soil heavy metal removal and phytoavailability: Field experiments

被引:109
作者
Guo, Xiaofang [1 ,2 ]
Wei, Zebin [2 ]
Wu, Qitang [2 ]
Li, Chunping [3 ]
Qian, Tianwei [1 ]
Zheng, Wei [1 ]
机构
[1] Taiyuan Univ Sci & Technol, Sch Environm & Safety, Taiyuan 030024, Peoples R China
[2] South China Agr Univ, Coll Nat Resources & Environm, Key Lab Ecol Agr, Minist Agr China, Guangzhou 510642, Guangdong, Peoples R China
[3] Beijing Bldg Mat Acad Sci Res, State Key Lab Solid Waste Reuse Bldg Mat, Beijing 100041, Peoples R China
基金
山西省青年科学基金; 中国国家自然科学基金;
关键词
Heavy metals; Soil washing; FeCl3; Mixture of chelators (MC); Co-cropping; Groundwater; CONTAMINATED PADDY SOILS; CHELANT EXTRACTION; REMEDIATED SOIL; EDTA; CADMIUM; PHYTOEXTRACTION; ACCUMULATION; TOXICITY; CD;
D O I
10.1016/j.chemosphere.2015.12.087
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In a field experiment on multi-metal contaminated soil, we investigated the efficiency of Cd, Pb, Zn, and Cu removal by only mixture of chelators (MC) or combining with FeCl3. After washing treatment, a co cropping system was performed for heavy metals to be extracted by Sedum alfredii and to produce safe food from Zea mays. We analyzed the concentration of heavy metals in groundwater to evaluate the leashing risk of soil washing with FeCl3 and MC. Results showed that addition of FeCl3 was favorable to the removal of heavy metals in the topsoil. Metal leaching occurred mainly in rain season during the first co-cropping. The removal rates of Cd, Zn, Pb, and Cu in topsoil were 28%, 53%, 41%, and 21% with washing by FeCl3+MC after first harvest. The application of FeCl3 reduced the yield of S. alfredii and increased the metals concentration of Z. mays in first harvest. However, after amending soil, the metals concentration of Z mays in FeCl3+MC treatment were similar to that only washing by MC. The grains and shoots of Z. mays were safe for use in feed production. Soil washing did not worsen groundwater contamination during the study period. But the concentration of Cd in groundwater was higher than the limit value of Standard concentrations for Groundwater IV. This study suggests that soil washing using FeCl3 and MC for the remediation of multi-metal contaminated soil is potential feasibility. However, the subsequent measure to improve the washed soil environment for planting crop is considered. (C) 2016 Published by Elsevier Ltd.
引用
收藏
页码:412 / 419
页数:8
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